Commit | Line | Data |
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c08098f2 VG |
1 | /* |
2 | * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com) | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License version 2 as | |
6 | */ | |
7 | ||
8 | #include <linux/ptrace.h> | |
0ef88a54 VG |
9 | #include <linux/module.h> |
10 | #include <linux/mm.h> | |
11 | #include <linux/fs.h> | |
12 | #include <linux/kdev_t.h> | |
13 | #include <linux/fs_struct.h> | |
14 | #include <linux/proc_fs.h> | |
15 | #include <linux/file.h> | |
16 | #include <asm/arcregs.h> | |
17 | ||
18 | /* | |
19 | * Common routine to print scratch regs (r0-r12) or callee regs (r13-r25) | |
20 | * -Prints 3 regs per line and a CR. | |
21 | * -To continue, callee regs right after scratch, special handling of CR | |
22 | */ | |
23 | static noinline void print_reg_file(long *reg_rev, int start_num) | |
24 | { | |
25 | unsigned int i; | |
26 | char buf[512]; | |
27 | int n = 0, len = sizeof(buf); | |
28 | ||
0ef88a54 VG |
29 | for (i = start_num; i < start_num + 13; i++) { |
30 | n += scnprintf(buf + n, len - n, "r%02u: 0x%08lx\t", | |
31 | i, (unsigned long)*reg_rev); | |
32 | ||
33 | if (((i + 1) % 3) == 0) | |
34 | n += scnprintf(buf + n, len - n, "\n"); | |
35 | ||
bd3c8b11 | 36 | /* because pt_regs has regs reversed: r12..r0, r25..r13 */ |
0ef88a54 VG |
37 | reg_rev--; |
38 | } | |
39 | ||
40 | if (start_num != 0) | |
41 | n += scnprintf(buf + n, len - n, "\n\n"); | |
42 | ||
bd3c8b11 VG |
43 | /* To continue printing callee regs on same line as scratch regs */ |
44 | if (start_num == 0) | |
45 | pr_info("%s", buf); | |
46 | else | |
47 | pr_cont("%s\n", buf); | |
0ef88a54 VG |
48 | } |
49 | ||
50 | static void show_callee_regs(struct callee_regs *cregs) | |
51 | { | |
52 | print_reg_file(&(cregs->r13), 13); | |
53 | } | |
54 | ||
55 | void print_task_path_n_nm(struct task_struct *tsk, char *buf) | |
56 | { | |
57 | struct path path; | |
58 | char *path_nm = NULL; | |
59 | struct mm_struct *mm; | |
60 | struct file *exe_file; | |
61 | ||
62 | mm = get_task_mm(tsk); | |
63 | if (!mm) | |
64 | goto done; | |
65 | ||
66 | exe_file = get_mm_exe_file(mm); | |
67 | mmput(mm); | |
68 | ||
69 | if (exe_file) { | |
70 | path = exe_file->f_path; | |
71 | path_get(&exe_file->f_path); | |
72 | fput(exe_file); | |
73 | path_nm = d_path(&path, buf, 255); | |
74 | path_put(&path); | |
75 | } | |
76 | ||
77 | done: | |
681a90ff | 78 | pr_info("Path: %s\n", path_nm); |
0ef88a54 VG |
79 | } |
80 | EXPORT_SYMBOL(print_task_path_n_nm); | |
81 | ||
82 | static void show_faulting_vma(unsigned long address, char *buf) | |
83 | { | |
84 | struct vm_area_struct *vma; | |
85 | struct inode *inode; | |
86 | unsigned long ino = 0; | |
87 | dev_t dev = 0; | |
88 | char *nm = buf; | |
5040573e | 89 | struct mm_struct *active_mm = current->active_mm; |
0ef88a54 | 90 | |
bd3c8b11 VG |
91 | /* can't use print_vma_addr() yet as it doesn't check for |
92 | * non-inclusive vma | |
93 | */ | |
5040573e DB |
94 | down_read(&active_mm->mmap_sem); |
95 | vma = find_vma(active_mm, address); | |
0ef88a54 VG |
96 | |
97 | /* check against the find_vma( ) behaviour which returns the next VMA | |
98 | * if the container VMA is not found | |
99 | */ | |
100 | if (vma && (vma->vm_start <= address)) { | |
101 | struct file *file = vma->vm_file; | |
102 | if (file) { | |
103 | struct path *path = &file->f_path; | |
104 | nm = d_path(path, buf, PAGE_SIZE - 1); | |
e77e4300 | 105 | inode = file_inode(vma->vm_file); |
0ef88a54 VG |
106 | dev = inode->i_sb->s_dev; |
107 | ino = inode->i_ino; | |
108 | } | |
109 | pr_info(" @off 0x%lx in [%s]\n" | |
bd3c8b11 VG |
110 | " VMA: 0x%08lx to 0x%08lx\n", |
111 | vma->vm_start < TASK_UNMAPPED_BASE ? | |
112 | address : address - vma->vm_start, | |
113 | nm, vma->vm_start, vma->vm_end); | |
5040573e | 114 | } else |
0ef88a54 | 115 | pr_info(" @No matching VMA found\n"); |
5040573e DB |
116 | |
117 | up_read(&active_mm->mmap_sem); | |
0ef88a54 VG |
118 | } |
119 | ||
120 | static void show_ecr_verbose(struct pt_regs *regs) | |
121 | { | |
502a0c77 | 122 | unsigned int vec, cause_code; |
0ef88a54 VG |
123 | unsigned long address; |
124 | ||
502a0c77 | 125 | pr_info("\n[ECR ]: 0x%08lx => ", regs->event); |
0ef88a54 VG |
126 | |
127 | /* For Data fault, this is data address not instruction addr */ | |
128 | address = current->thread.fault_address; | |
129 | ||
502a0c77 VG |
130 | vec = regs->ecr_vec; |
131 | cause_code = regs->ecr_cause; | |
0ef88a54 VG |
132 | |
133 | /* For DTLB Miss or ProtV, display the memory involved too */ | |
134 | if (vec == ECR_V_DTLB_MISS) { | |
65464152 VG |
135 | pr_cont("Invalid %s @ 0x%08lx by insn @ 0x%08lx\n", |
136 | (cause_code == 0x01) ? "Read" : | |
137 | ((cause_code == 0x02) ? "Write" : "EX"), | |
0ef88a54 VG |
138 | address, regs->ret); |
139 | } else if (vec == ECR_V_ITLB_MISS) { | |
140 | pr_cont("Insn could not be fetched\n"); | |
141 | } else if (vec == ECR_V_MACH_CHK) { | |
142 | pr_cont("%s\n", (cause_code == 0x0) ? | |
143 | "Double Fault" : "Other Fatal Err"); | |
144 | ||
145 | } else if (vec == ECR_V_PROTV) { | |
146 | if (cause_code == ECR_C_PROTV_INST_FETCH) | |
147 | pr_cont("Execute from Non-exec Page\n"); | |
0ef88a54 VG |
148 | else if (cause_code == ECR_C_PROTV_MISALIG_DATA) |
149 | pr_cont("Misaligned r/w from 0x%08lx\n", address); | |
65464152 VG |
150 | else |
151 | pr_cont("%s access not allowed on page\n", | |
152 | (cause_code == 0x01) ? "Read" : | |
153 | ((cause_code == 0x02) ? "Write" : "EX")); | |
0ef88a54 VG |
154 | } else if (vec == ECR_V_INSN_ERR) { |
155 | pr_cont("Illegal Insn\n"); | |
156 | } else { | |
157 | pr_cont("Check Programmer's Manual\n"); | |
158 | } | |
159 | } | |
160 | ||
161 | /************************************************************************ | |
162 | * API called by rest of kernel | |
163 | ***********************************************************************/ | |
c08098f2 VG |
164 | |
165 | void show_regs(struct pt_regs *regs) | |
166 | { | |
0ef88a54 VG |
167 | struct task_struct *tsk = current; |
168 | struct callee_regs *cregs; | |
169 | char *buf; | |
170 | ||
171 | buf = (char *)__get_free_page(GFP_TEMPORARY); | |
172 | if (!buf) | |
173 | return; | |
174 | ||
175 | print_task_path_n_nm(tsk, buf); | |
a43cb95d | 176 | show_regs_print_info(KERN_INFO); |
0ef88a54 | 177 | |
502a0c77 | 178 | show_ecr_verbose(regs); |
0ef88a54 | 179 | |
bd3c8b11 VG |
180 | pr_info("[EFA ]: 0x%08lx\n[BLINK ]: %pS\n[ERET ]: %pS\n", |
181 | current->thread.fault_address, | |
182 | (void *)regs->blink, (void *)regs->ret); | |
0ef88a54 | 183 | |
bd3c8b11 VG |
184 | if (user_mode(regs)) |
185 | show_faulting_vma(regs->ret, buf); /* faulting code, not data */ | |
0ef88a54 | 186 | |
bd3c8b11 VG |
187 | pr_info("[STAT32]: 0x%08lx", regs->status32); |
188 | ||
189 | #define STS_BIT(r, bit) r->status32 & STATUS_##bit##_MASK ? #bit : "" | |
190 | if (!user_mode(regs)) | |
191 | pr_cont(" : %2s %2s %2s %2s %2s\n", | |
192 | STS_BIT(regs, AE), STS_BIT(regs, A2), STS_BIT(regs, A1), | |
193 | STS_BIT(regs, E2), STS_BIT(regs, E1)); | |
0ef88a54 | 194 | |
bd3c8b11 VG |
195 | pr_info("BTA: 0x%08lx\t SP: 0x%08lx\t FP: 0x%08lx\n", |
196 | regs->bta, regs->sp, regs->fp); | |
0ef88a54 VG |
197 | pr_info("LPS: 0x%08lx\tLPE: 0x%08lx\tLPC: 0x%08lx\n", |
198 | regs->lp_start, regs->lp_end, regs->lp_count); | |
199 | ||
200 | /* print regs->r0 thru regs->r12 | |
201 | * Sequential printing was generating horrible code | |
202 | */ | |
203 | print_reg_file(&(regs->r0), 0); | |
204 | ||
205 | /* If Callee regs were saved, display them too */ | |
206 | cregs = (struct callee_regs *)current->thread.callee_reg; | |
207 | if (cregs) | |
208 | show_callee_regs(cregs); | |
209 | ||
210 | free_page((unsigned long)buf); | |
c08098f2 VG |
211 | } |
212 | ||
213 | void show_kernel_fault_diag(const char *str, struct pt_regs *regs, | |
38a9ff6d | 214 | unsigned long address) |
c08098f2 | 215 | { |
0ef88a54 | 216 | current->thread.fault_address = address; |
0ef88a54 VG |
217 | |
218 | /* Caller and Callee regs */ | |
219 | show_regs(regs); | |
220 | ||
221 | /* Show stack trace if this Fatality happened in kernel mode */ | |
222 | if (!user_mode(regs)) | |
223 | show_stacktrace(current, regs); | |
c08098f2 | 224 | } |
0ef88a54 VG |
225 | |
226 | #ifdef CONFIG_DEBUG_FS | |
227 | ||
228 | #include <linux/module.h> | |
229 | #include <linux/fs.h> | |
230 | #include <linux/mount.h> | |
231 | #include <linux/pagemap.h> | |
232 | #include <linux/init.h> | |
233 | #include <linux/namei.h> | |
234 | #include <linux/debugfs.h> | |
235 | ||
236 | static struct dentry *test_dentry; | |
237 | static struct dentry *test_dir; | |
238 | static struct dentry *test_u32_dentry; | |
239 | ||
240 | static u32 clr_on_read = 1; | |
241 | ||
242 | #ifdef CONFIG_ARC_DBG_TLB_MISS_COUNT | |
243 | u32 numitlb, numdtlb, num_pte_not_present; | |
244 | ||
245 | static int fill_display_data(char *kbuf) | |
246 | { | |
247 | size_t num = 0; | |
248 | num += sprintf(kbuf + num, "I-TLB Miss %x\n", numitlb); | |
249 | num += sprintf(kbuf + num, "D-TLB Miss %x\n", numdtlb); | |
250 | num += sprintf(kbuf + num, "PTE not present %x\n", num_pte_not_present); | |
251 | ||
252 | if (clr_on_read) | |
253 | numitlb = numdtlb = num_pte_not_present = 0; | |
254 | ||
255 | return num; | |
256 | } | |
257 | ||
258 | static int tlb_stats_open(struct inode *inode, struct file *file) | |
259 | { | |
260 | file->private_data = (void *)__get_free_page(GFP_KERNEL); | |
261 | return 0; | |
262 | } | |
263 | ||
264 | /* called on user read(): display the couters */ | |
265 | static ssize_t tlb_stats_output(struct file *file, /* file descriptor */ | |
266 | char __user *user_buf, /* user buffer */ | |
267 | size_t len, /* length of buffer */ | |
268 | loff_t *offset) /* offset in the file */ | |
269 | { | |
270 | size_t num; | |
271 | char *kbuf = (char *)file->private_data; | |
272 | ||
273 | /* All of the data can he shoved in one iteration */ | |
274 | if (*offset != 0) | |
275 | return 0; | |
276 | ||
277 | num = fill_display_data(kbuf); | |
278 | ||
279 | /* simple_read_from_buffer() is helper for copy to user space | |
280 | It copies up to @2 (num) bytes from kernel buffer @4 (kbuf) at offset | |
281 | @3 (offset) into the user space address starting at @1 (user_buf). | |
282 | @5 (len) is max size of user buffer | |
283 | */ | |
284 | return simple_read_from_buffer(user_buf, num, offset, kbuf, len); | |
285 | } | |
286 | ||
287 | /* called on user write : clears the counters */ | |
288 | static ssize_t tlb_stats_clear(struct file *file, const char __user *user_buf, | |
289 | size_t length, loff_t *offset) | |
290 | { | |
291 | numitlb = numdtlb = num_pte_not_present = 0; | |
292 | return length; | |
293 | } | |
294 | ||
295 | static int tlb_stats_close(struct inode *inode, struct file *file) | |
296 | { | |
297 | free_page((unsigned long)(file->private_data)); | |
298 | return 0; | |
299 | } | |
300 | ||
301 | static const struct file_operations tlb_stats_file_ops = { | |
302 | .read = tlb_stats_output, | |
303 | .write = tlb_stats_clear, | |
304 | .open = tlb_stats_open, | |
305 | .release = tlb_stats_close | |
306 | }; | |
307 | #endif | |
308 | ||
309 | static int __init arc_debugfs_init(void) | |
310 | { | |
311 | test_dir = debugfs_create_dir("arc", NULL); | |
312 | ||
313 | #ifdef CONFIG_ARC_DBG_TLB_MISS_COUNT | |
314 | test_dentry = debugfs_create_file("tlb_stats", 0444, test_dir, NULL, | |
315 | &tlb_stats_file_ops); | |
316 | #endif | |
317 | ||
318 | test_u32_dentry = | |
319 | debugfs_create_u32("clr_on_read", 0444, test_dir, &clr_on_read); | |
320 | ||
321 | return 0; | |
322 | } | |
323 | ||
324 | module_init(arc_debugfs_init); | |
325 | ||
326 | static void __exit arc_debugfs_exit(void) | |
327 | { | |
328 | debugfs_remove(test_u32_dentry); | |
329 | debugfs_remove(test_dentry); | |
330 | debugfs_remove(test_dir); | |
331 | } | |
332 | module_exit(arc_debugfs_exit); | |
333 | ||
334 | #endif |